CN106059312B - A kind of control method of the source Z DC converter - Google Patents
A kind of control method of the source Z DC converter Download PDFInfo
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- CN106059312B CN106059312B CN201610569753.3A CN201610569753A CN106059312B CN 106059312 B CN106059312 B CN 106059312B CN 201610569753 A CN201610569753 A CN 201610569753A CN 106059312 B CN106059312 B CN 106059312B
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33569—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having several active switching elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
- Inverter Devices (AREA)
Abstract
The invention discloses a kind of source Z DC converter and its control methods.The source Z DC converter, comprising: inverter bridge, resonant slots, transformer and rectifier bridge；Inverter bridge is electrically connected by Z source impedance network with DC power supply, for direct current signal to be converted into AC signal, output AC signal to transformer；Resonant slots are series between inverter bridge and the primary side of transformer, for for the AC signal additional resonance signal of inverter bridge output, passing through the AC signal after transformer output additional resonance signal to rectifier bridge when inverter bridge is in pass-through state；Rectifier bridge is electrically connected with the secondary side of transformer, for carrying out rectification processing to the AC signal after additional resonance signal, the direct current signal after output rectification to load.The present invention solves the problems, such as that Z source converter switching loss is high in the prior art, reduces switching loss, improves the safety and reliability of the source Z DC converter.
Description
Technical field
The present embodiments relate to power electronic technique more particularly to a kind of control methods of source Z DC converter.
Background technique
The source Z DC converter is coupled by introducing an impedance network, by main converter circuit with power supply or load.Exactly
Due to the property of impedance network, so that same converter has boosting and buck functionality simultaneously, output voltage range increases,
Meet photovoltaic cell group it is grid-connected when requirement, have preferable promotion prospect.
Currently, mainly including the working principle and modulation plan of the source Z DC converter to the research contents of the source Z DC converter
Slightly, the modeling with control and the application of the source Z DC converter etc. of the source Z DC converter.Due to the source Z DC converter energy
Conventional voltage source and the unexistent stepping functions of current-source convertor are enough provided, can adapt to the variation of input voltage wide scope
Occasion.It is applied in grid-connected power generation system, compared to traditional two-stage type changed power, main circuit saving one is active
Device, circuit structure are succinct.
But the source Z DC converter is in the process of running, the power when switching frequency is continuously improved, in the unit time
Element switch number relative increase, opens and turns off brought switching loss and electromagnetic interference increases therewith, leads to the source Z direct current
The switching loss of switching tube is higher in converter, and switching loss height becomes its widely applied key factor of restriction.
Summary of the invention
The present invention provides a kind of control method of source Z DC converter, to reduce the switching loss of the source Z DC converter,
Improve the safety and reliability of the source Z DC converter.
In a first aspect, the embodiment of the invention provides a kind of source Z DC converters, comprising: inverter bridge, resonant slots, transformation
Device and rectifier bridge；
The inverter bridge is electrically connected by Z source impedance network with DC power supply, for direct current signal to be converted into exchange letter
Number, output AC signal to transformer；
The resonant slots are series between the inverter bridge and the primary side of the transformer, for being in straight-through in inverter bridge
It is the AC signal additional resonance signal of inverter bridge output, after exporting additional resonance signal by transformer when state
AC signal is to rectifier bridge；
The rectifier bridge is electrically connected with the secondary side of transformer, for rectifying to the AC signal after additional resonance signal
Processing, the direct current signal after output rectification extremely load.
Further, the resonant slots include resonant inductance and resonant capacitance；
The resonant inductance is series between the inverter bridge and the transformer, and, the resonant capacitance is connected in parallel on
The primary side of the transformer.
Further, it is in series between the DC power supply and Z source impedance network for preventing Z source impedance network electric current from returning
The element of stream.
It further, further include DC filtering inductance, the DC filtering inductance is series at the rectifier bridge and load
Between, for inhibiting the dash current exported into the direct current signal of the load.
Second aspect, the embodiment of the invention also provides a kind of control methods of source Z DC converter, including above-mentioned first
The source the Z DC converter of aspect, control method include:
According to the drive pulse signal of inverter bridge, the corresponding source the Z direct current of each operating mode in a switch periods is determined
The equivalent circuit of converter calculates the current parameters and voltage parameter of resonant slots according to the equivalent circuit；
According to the current parameters and voltage parameter of the resonant slots, the straight-through pulse signal of the source Z DC converter is determined
The straight-through time；
The drive pulse signal that the inverter bridge is adjusted according to the straight-through time, makes the rising of the drive pulse signal
Edge and failing edge were respectively positioned in the range of the straight-through time, to realize the Sofe Switch of the inverter bridge.
Further, the current parameters are the current value i of resonant inductanceLs, and, the voltage parameter is resonant capacitance
Voltage value VCp。
Further, according to the current parameters and voltage parameter of the resonant slots, the straight-through arteries and veins of the source Z DC converter is determined
Rush the straight-through time of signal, comprising:
According to the voltage value V of resonant capacitanceCpRelational expression and resonant inductance current value iLsRelational expression, determine that the source Z is straight
The phase-plane diagram of current converter；
The duration relational expression of each operating mode in a switch periods is determined according to the phase-plane diagram；
Determine that no-voltage opens the time range with zero-current switching according to the duration relational expression, by zero electricity
Press off the straight-through time opened with the sum of time of zero-current switching as straight-through pulse signal.
Further, determine that no-voltage opens the time range with zero-current switching according to the duration relational expression,
Include:
Average voltage according to a switch periods interior resonance inductance is zero, and, voltage value VCpIn a switch periods
First half and latter half polarity on the contrary, solve the duration relational expression, obtain no-voltage opening time range
With zero-current switching time range.
Further, further includes:
The initial time of the zero-current switching time is current value iLsEqual to inverter bridge DC bus current ipnWhen
It carves.
The present invention is in pass-through state by the series resonance slot between inverter bridge and the primary side of transformer, in inverter bridge
When, resonant slots start resonance, for the AC signal additional resonance signal of inverter bridge output, are added by transformer output humorous
The AC signal after signal shake to rectifier bridge, to be load supplying by rectifier bridge, inverter bridge is opened using no-voltage and
Zero-current switching mode solves the problems, such as that Z source converter switching loss is high in the prior art, reduces switching loss, improves Z
The safety and reliability of source DC converter.
Detailed description of the invention
Fig. 1 is the circuit diagram of the source the Z DC converter in the embodiment of the present invention one；
Fig. 2 is the production principle figure of the drive pulse signal of the source the Z DC converter in the embodiment of the present invention one；
Fig. 3 is the working principle waveform diagram of the source the Z DC converter in the embodiment of the present invention one；
Fig. 4 a is the corresponding source the Z DC converting of working condition of the mode one of a switch periods in the embodiment of the present invention one
The circuit diagram of device；
Fig. 4 b is the corresponding source the Z DC converting of working condition of the mode two of a switch periods in the embodiment of the present invention one
The circuit diagram of device；
Fig. 4 c is the corresponding source the Z DC converting of working condition of the mode three of a switch periods in the embodiment of the present invention one
The circuit diagram of device；
Fig. 4 d is the corresponding source the Z DC converting of working condition of the mode four of a switch periods in the embodiment of the present invention one
The circuit diagram of device；
Fig. 4 e is the corresponding source the Z DC converting of working condition of the mode five of a switch periods in the embodiment of the present invention one
The circuit diagram of device；
Fig. 4 f is the corresponding source the Z DC converting of working condition of the mode six of a switch periods in the embodiment of the present invention one
The circuit diagram of device；
Fig. 5 a is that the mode one of a switch periods in the embodiment of the present invention one is corresponding with the working condition of mode two etc.
Imitate circuit diagram；
Fig. 5 b is the corresponding equivalent circuit diagram of working condition of the mode three of a switch periods in the embodiment of the present invention one；
Fig. 5 c is the corresponding equivalent circuit diagram of working condition of the mode four of a switch periods in the embodiment of the present invention one；
Fig. 5 d is that the mode five of a switch periods in the embodiment of the present invention one is corresponding with the working condition of mode six etc.
Imitate circuit diagram；
Fig. 6 is the phase-plane diagram of the source the Z DC converter in the embodiment of the present invention one；
Fig. 7 is the flow chart of the control method of the source Z DC converter in the embodiment of the present invention two.
Specific embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining the present invention rather than limiting the invention.It also should be noted that in order to just
Only the parts related to the present invention are shown in description, attached drawing rather than entire infrastructure.
Embodiment one
Fig. 1 is the circuit diagram for the source the Z DC converter that the embodiment of the present invention one provides, and the present embodiment is applicable to defeated
Out the case where scope range of the fluctuation of voltage biggish photovoltaic power generation grid-connecting, specifically include: inverter bridge 110, resonant slots 120, transformer and
Rectifier bridge 130.
The inverter bridge 110 is electrically connected by Z source impedance network with DC power supply, for direct current signal to be converted into exchanging
Signal, output AC signal to transformer.The resonant slots 120 are series at the primary side of the inverter bridge 110 and the transformer
Between, for when inverter bridge 110 is in pass-through state, being the AC signal additional resonance signal of the inverter bridge 110 output,
Pass through the AC signal after transformer output additional resonance signal to rectifier bridge 130.The secondary side of the rectifier bridge 130 and transformer
Electrical connection, for carrying out rectification processing to the AC signal after additional resonance signal, the direct current signal after output rectification to load.
Wherein, DC power supply can be photovoltaic cell.It is in series between the DC power supply and Z source impedance network for preventing
The only element of Z source impedance network current reflux.For example, using diode D as the element for preventing Z source impedance network current reflux.
Photovoltaic cell exports direct current signal to Z source impedance network by diode D.
Z source impedance network includes the inductance and capacitor (L that photovoltaic cell output end is connected in parallel on X-shaped1, L2, C1, C2), and will
Z source impedance network is designed as symmetrical network.
Inverter bridge 110 includes switching tube, and the switching tube can be insulated gate bipolar transistor (abbreviation IGBT).Inversion
The connection type of bridge 110, which can be, to be separately connected there are two IGBT (S on upper and lower bridge arm1、S2、S3、S4).On each IGBT
Equal inverse parallel has freewheeling diode, and corresponding relationship is insulated gate bipolar transistor S1Corresponding sustained diode1, insulated gate bipolar
Transistor npn npn S2Corresponding sustained diode2, insulated gate bipolar transistor S3Corresponding sustained diode3, and, insulated gate is double
Bipolar transistor S4Corresponding sustained diode4。
Resonant slots 120 include resonant inductance LsWith resonant capacitance Cp, the resonant inductance LsIt is series at the inverter bridge 110
Between the transformer, and, the resonant capacitance CpIt is connected in parallel on the primary side of the transformer.Wherein, transformer is isolation
Transformer T.
The secondary side of isolating transformer T is in series with rectifier bridge 130, and the upper and lower bridge arm of the rectifier bridge 130 is separately connected two
Diode (M1, M2, M3, M4).It based on the above technical solution, further include DC filtering inductance Lf, the DC filtering electricity
Feel LfIt is series between the rectifier bridge 130 and load, for inhibiting the impact exported into the direct current signal of the load electricity
Stream.
The embodiment of the present invention is in straight-through by the series resonance slot between inverter bridge and the primary side of transformer, in inverter bridge
When state, resonant slots start resonance, for the AC signal additional resonance signal of inverter bridge output, are exported by transformer attached
AC signal after adding resonance signal is opened inverter bridge using no-voltage to be load supplying by rectifier bridge to rectifier bridge
Open with zero-current switching mode, solve the problems, such as that Z source converter switching loss is high in the prior art, reduces switching loss, mentions
The high safety and reliability of the source Z DC converter.
Based on the above technical solution, the inductance (L of Z source impedance network1、L2) and DC filtering inductance LfIt is long-range
In the resonant inductance L of resonant slots 120sValue, and the inductance (C of Z source impedance network1、C2) humorous much larger than resonant slots 120
Shake capacitor CpValue.Therefore, the inductance and capacitor of Z source impedance network can be equivalent to current source (I respectivelyL1、IL2、ILf) and
Voltage source (VC1、VC2).Due to the symmetry of Z source impedance network, and, the electric current of the capacitor of Z source impedance network is flowed through at one
Average value in switch periods is zero, available:
VC=VC1=VC2 (1)
IL=IL1=IL2=Ii (2)
ILf=Iout (3)
Wherein, VC1、VC2The respectively first capacitor C of Z source impedance network1With the second capacitor C2Voltage.IL1、IL2Respectively
For the first inductance L for flowing through Z source impedance network1With the second inductance L2Electric current.ILfTo flow through DC filtering inductance LfElectric current.Ii
And IoutThe respectively average value of DC power supply and load-side electric current in a switch periods.The electric current of transformer primary side is one
Positive and negative alternate square wave, if setting square wave amplitude as IT, transformer voltage ratio n, then primary side current of transformer iTIt can indicate are as follows:
Fig. 2 is the production principle figure of the drive pulse signal of the source the Z DC converter in the embodiment of the present invention one.It will load
On voltage VoIt is input to switching tube drive module, by comparing voltage VoWith preset reference voltage VorefObtain voltage deviation Δ
Vo.By voltage deviation Δ VoVoltage controlled oscillator is inputted, handles output switching frequency f through voltage controlled oscillators, by switching frequency fsIt is defeated
Enter pulse-modulator, output switching tube S is handled by pulse-modulator1To S4Drive pulse signal vGS1~vGS4.In turn, lead to
On and off in Guan Yi switch periods of overdrive pulse Signal-controlled switch.To which detection obtains a switch week
Switching tube (S is flowed through in phase1~S4) electric current iS1~iS4, flow through the electric current i of diode DD, flow through resonant inductance LSElectric current
iLS, flow through inverter bridge DC bus current ipn, and flow through the electric current i of transformer primary sideT.It is opened in addition, also detecting and obtaining one
Close inverter bridge output voltage v in the periodacWith resonant capacitance CpOn voltageObtain the source Z shown in Fig. 3 DC converter
Working principle waveform diagram.
As shown in figure 3, a switch periods can be divided into 12 operating modes, due to preceding 6 operational modules and rear 6 works
The working condition of operation mode is similar, makes a concrete analysis of preceding 6 operating modes below.
1) 1 (t of operating mode0~t1Stage)
Under the corresponding working condition of operating mode 1, the circuit diagram of the source Z DC converter is as shown in fig. 4 a.Wherein, it opens
Close pipe S1To S4It is on state.As shown in figure 3, in t0Moment iLS<ipn, therefore, sustained diode2And D3Shutdown, electricity
The change of current is flowed to switching tube S2And S3, inverter bridge is in pass-through state, diode D shutdown, the first capacitor of Z source impedance network at this time
C1With the second capacitor C2The first inductance L is given respectively1With the second inductance L2Constant-voltage charge, resonant inductance LSWith resonant capacitance CpStart humorous
Vibration.Diode M in transformer secondary side, in rectifier bridge2、M3Powering load is connected.At this point, the source Z DC converter is working
The equivalent circuit diagram of mode 1 is as shown in Figure 5 a, available:
vL(t)=VC (5)
It is assumed thatIt is available:
Wherein,
ωrFor the angular frequency of resonant slots,
ZrFor the characteristic impedance of resonant slots,
2) 2 (t of operating mode1~t2Stage)
Under the corresponding working condition of operating mode 2, the circuit diagram of the source Z DC converter is as shown in Figure 4 b.In t1When
It carves, resonant inductance electric current iLSWith inverter bridge input current iPnIt is equal, and by iLs< ipnTo iLS> ipnVariation.At this point, switching tube
S2And S3Shutdown, current commutation to diode D2And D3, inverter bridge is still in pass-through state.Diode D shutdown, Z source impedance network
First capacitor C1With the second capacitor C2The first inductance L is given respectively1With the second inductance L2Constant-voltage charge, resonant inductance LSWith resonance electricity
Hold CpStart resonance.Diode M in transformer secondary side, in rectifier bridge2、M3Powering load is connected.At this point, the source Z direct current becomes
Parallel operation is as shown in Figure 5 a in the equivalent circuit diagram of operating mode 2,WithExpression formula it is identical as operating mode 1.
3) 3 (t of operating mode2~t3Stage)
Under the corresponding working condition of operating mode 3, the circuit diagram of the source Z DC converter is as illustrated in fig. 4 c.In t2When
It carves, resonant inductance electric current iLSReach maximum value；Resonant capacitor voltageAnd byToVariation；Become
Depressor electric current turns negative number to positive number.At this point, diode M in rectifier bridge2And M3Shutdown, M1And M4Conducting.Switching tube S1And S4Conducting, switch
Pipe S2And S3Shutdown, current commutation to diode D2And D3, inverter bridge is still in pass-through state.Diode D shutdown, Z source impedance net
The first capacitor C of network1With the second capacitor C2The first inductance L is given respectively1With the second inductance L2Constant-voltage charge, resonant inductance LSAnd resonance
Capacitor CpStart resonance.Diode M in transformer secondary side, in rectifier bridge1、M4Powering load is connected.At this point, the source Z direct current
Converter is as shown in Figure 5 b in the equivalent circuit diagram of operating mode 3, available:
vL(t)=VC (11)
It is obtained by formula (12):
Wherein, Im、ωrAnd ZrRelational expression see formula (8) to (10), details are not described herein again.
4) 4 (t of operating mode3~t4Stage)
Under the corresponding working condition of operating mode 4, the circuit diagram of the source Z DC converter is as shown in figure 4d.In t3When
It carves, resonant inductance electric current iLSEqual to inverter bridge input current iPn, and t3I in the previous operating mode at momentLS> ipn.At this point,
D2And D3Shutdown, inverter bridge are in non-pass-through state, and inverter bridge DC bus-bar voltageAt this point,
Diode D shutdown, the first capacitor C of Z source impedance network1With the second capacitor C2The first inductance L is given respectively1With the second inductance L2It is permanent
Pressure charging, resonant inductance LSWith resonant capacitance CpStart resonance.Diode M in transformer secondary side, in rectifier bridge1、M4Conducting
Powering load.At this point, the source Z DC converter is as shown in Figure 5 c in the equivalent circuit diagram of operating mode 4, it is available:
5) 5 (t of operating mode4~t5Stage)
Under the corresponding working condition of operating mode 5, the circuit diagram of the source Z DC converter is as shown in fig 4e.In t4When
It carves,iD> 0, diode D conducting, DC power supply are first capacitor C1With the second capacitor C2Charging.
At this point, the source Z DC converter operating mode 5 equivalent circuit diagram as fig 5d, it is available:
vL(t)=Vi-VC (16)
It is available by formula (17):
Wherein, ωrAnd ZrRelational expression see formula (9) and (10), details are not described herein again.
6) 6 (t of operating mode5~t6Stage)
Under the corresponding working condition of operating mode 6, the circuit diagram of the source Z DC converter is as shown in fig. 4f.In t5When
It carves, resonant inductance electric current iLS=0, and by iLs> 0 to iLS< 0 variation.At this point, switching tube S1And S4Shutdown, current commutation to afterflow
Diode D1And D4, diode D conducting, DC power supply is first capacitor C1With the second capacitor C2Charging.At this point, the source Z DC converting
Device operating mode 6 equivalent circuit diagram as fig 5d,WithExpression formula it is similar with operating mode 5.
Operating mode 7 to operating mode 12 and operating mode 1 to operating mode 6 is the relationship of phase-inversion symmetric, by Working mould
Formula 1 is to operating mode 6WithRelational expression, can obtain operating mode 7 to operating mode 12 aboutWithRelational expression.According in a switch periodsWithRelational expression, determine the source Z direct current become
The phase-plane diagram of parallel operation.As shown in fig. 6, phase-plane diagram withFor abscissa,For ordinate.Each operating mode is held
The continuous time is as follows:
It is assumed that TsIt is available for switch periods:
T01+T12+T23+T34+T46=Ts/2 (24)
It is available since the average voltage of inductance is zero in middle Z source impedance network in a switch periods:
Wherein,
Due in a switch periods, the operating mode (operating mode 1 to operating mode 6) and latter half of first half
Operational module (operating mode 7 to operating mode 12) phase-inversion symmetric, have By the phase plane of Fig. 6
Known to figure:
It is assumed that circuit parameter and working condition determine, i.e. transformer voltage ratio n, resonant slots angular frequencyr, resonant slots characteristic resistance
Anti- Zr, input voltage Vi, input current Ii, output electric current IoutWith switch periods TsIt is known.By (2) formula, (4) formula, (19)~
(23) formula and (26)~(27) substitute into (24) formula, and (25) formula and (28) formula obtain (Vc, Im, I0).Again by (Vc, Im, I0) substitute into
(19)~(21) formula, obtains no-voltage opening time T01With zero-current switching time T13.By the no-voltage opening time and zero
Straight-through time of the sum of the time of switch off current as straight-through pulse signal.Enable inverter bridge DC bus-bar voltage vpnIn the straight-through time
Value be zero, to obtain straight-through pulse signal.Straight-through pulse signal is input to switching tube drive module, according to described straight
Strobe signal adjusts the drive pulse signal of switching tube, and the rising edge of the drive pulse signal and failing edge is made to be respectively positioned on institute
In the range of stating the straight-through time, to realize the Sofe Switch of the inverter bridge.
Embodiment two
Fig. 7 is the flow chart of the control method of the source Z DC converter in the embodiment of the present invention two.The technical side of the present embodiment
Case is used to control the source the Z DC converter of above-described embodiment, realizes the Sofe Switch of the source Z DC converter, specifically include as
Lower step:
Step 210, the drive pulse signal according to inverter bridge determine that each operating mode is corresponding in a switch periods
The equivalent circuit of the source Z DC converter calculates the current parameters and voltage parameter of resonant slots according to the equivalent circuit.
Wherein, the drive pulse signal of inverter bridge can be exported by the switching tube drive module of above-described embodiment.Drive arteries and veins
The generation process for rushing signal is shown in above-described embodiment, and details are not described herein again.Controller obtains the drive pulse signal of inverter bridge, and examines
It surveys in a switch periods and flows through switching tube (S1~S4) electric current iS1~iS4, flow through the electric current i of diode DD, flow through resonance electricity
Feel LSElectric current iLS, flow through inverter bridge DC bus current ipn, and flow through the electric current i of transformer primary sideT.In addition, also detecting
Obtain inverter bridge output voltage v in a switch periodsacWith resonant capacitance CpOn voltageAccording to foregoing circuit parameter and
Operating mode, obtains the equivalent circuit of the source Z DC converter each operating mode in a switch periods, equivalent circuit with state
Embodiment is identical, and details are not described herein again.The current parameters and voltage parameter of resonant slots are calculated according to the equivalent circuit.Preferably
The current value i of the resonant inductance of resonant slots is calculated according to the equivalent circuitLs, and, the voltage value V of resonant capacitanceCp.Specifically
Calculation method is shown in above-described embodiment, and details are not described herein again.
Step 220, current parameters and voltage parameter according to the resonant slots, determine the straight-through arteries and veins of the source Z DC converter
Rush the straight-through time of signal.
Wherein, the straight-through time is inverter bridge DC bus-bar voltage vpnThe time for being zero.According to the voltage of resonant capacitance
Value VCpRelational expression and resonant inductance current value iLsRelational expression, determine the phase-plane diagram of the source Z DC converter.According to institute
State the duration relational expression that phase-plane diagram determines each operating mode in a switch periods.According to the duration relationship
Formula determines that no-voltage is opened and the time range of zero-current switching, for example, being averaged according to switch periods interior resonance inductance
Voltage is zero, and, voltage value VCpThe first half of switch periods and the polarity of latter half on the contrary, solving described in hold
Continuous time history form, obtains no-voltage opening time range and zero-current switching time range.The no-voltage is opened and zero
Straight-through time of the sum of the time of switch off current as straight-through pulse signal.
Step 230, the drive pulse signal that the inverter bridge is adjusted according to the straight-through time believe the driving pulse
Number rising edge and failing edge be respectively positioned in the range of the straight-through time, to realize the Sofe Switch of the inverter bridge.
The embodiment of the present invention passes through the current parameters of the corresponding resonant slots of operating mode each in one switch periods of calculating
And voltage parameter；To determine the straight-through time of the straight-through pulse signal of the source Z DC converter；It is adjusted further according to the straight-through time
The drive pulse signal of the inverter bridge makes the rising edge of the drive pulse signal and failing edge be respectively positioned on the straight-through time
In the range of, to realize the Sofe Switch of the inverter bridge.The embodiment of the present invention solves Z source converter switching loss in the prior art
High problem, reduces switching loss, improves the safety and reliability of the source Z DC converter.
Based on the above technical solution, the initial time of the zero-current switching time is current value iLsEqual to inversion
Bridge DC bus current ipnAt the time of.Also, in current value iLsNot less than inverter bridge DC bus current ipnWhen, realize inversion
Bridge zero-current switching.
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (4)
1. a kind of control method of source Z DC converter, the source Z DC converter, comprising: inverter bridge, resonant slots, transformer
And rectifier bridge；
The inverter bridge is electrically connected by Z source impedance network with DC power supply, defeated for direct current signal to be converted into AC signal
AC signal is to transformer out；
The resonant slots are series between the inverter bridge and the primary side of the transformer, for being in pass-through state in inverter bridge
When, for the AC signal additional resonance signal of inverter bridge output, pass through the exchange after transformer output additional resonance signal
Signal is to rectifier bridge；
The rectifier bridge is electrically connected with the secondary side of transformer, for carrying out at rectification to the AC signal after additional resonance signal
Reason, the direct current signal after output rectification extremely load；
It is characterized in that, its control method includes:
According to the drive pulse signal of inverter bridge, the corresponding source the Z DC converting of each operating mode in a switch periods is determined
The equivalent circuit of device calculates the current parameters and voltage parameter of resonant slots according to the equivalent circuit, wherein the current parameters
For the current value i of resonant inductanceLs, and, the voltage parameter is the voltage value V of resonant capacitanceCp；
According to the current value i of resonant inductanceLsWith the voltage value V of resonant capacitanceCp, determine the straight-through pulse letter of the source Z DC converter
Number the straight-through time；
The drive pulse signal that the inverter bridge is adjusted according to the straight-through time, make the drive pulse signal rising edge and
Failing edge was respectively positioned in the range of the straight-through time, to realize the Sofe Switch of the inverter bridge.
2. the control method of the source Z according to claim 1 DC converter, which is characterized in that according to the electricity of resonant inductance
Flow valuve iLsWith the voltage value V of resonant capacitanceCp, determine the straight-through time of the straight-through pulse signal of the source Z DC converter, comprising:
According to the voltage value V of resonant capacitanceCpRelational expression and resonant inductance current value iLsRelational expression, determine the source Z direct current become
The phase-plane diagram of parallel operation；
The duration relational expression of each operating mode in a switch periods is determined according to the phase-plane diagram；
It determines that no-voltage opens the time range with zero-current switching according to the duration relational expression, the no-voltage is opened
Open the straight-through time with the sum of time of zero-current switching as straight-through pulse signal.
3. the control method of the source Z according to claim 2 DC converter, which is characterized in that according to the duration
Relational expression determines that no-voltage opens the time range with zero-current switching, comprising:
Average voltage according to a switch periods interior resonance inductance is zero, and, voltage value VCpBefore a switch periods
Half part and the polarity of latter half obtain no-voltage opening time range and zero on the contrary, solve the duration relational expression
Current-off time range.
4. the control method of the source Z according to claim 3 DC converter, which is characterized in that further include:
The initial time of the zero-current switching time is current value iLsEqual to inverter bridge DC bus current ipnAt the time of.
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| CN101540554A (en) * | 2009-05-12 | 2009-09-23 | 大连理工大学 | Non-contact power transmission system based on Z-source inverter and phase-shifting control method thereof |
| CN102005926A (en) * | 2009-09-03 | 2011-04-06 | 天津工程师范学院 | Non-contact electric energy transmission system based on Z-source inverter and phase-shifted control method of transmission system |
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| US7130205B2 (en) * | 2002-06-12 | 2006-10-31 | Michigan State University | Impedance source power converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101540554A (en) * | 2009-05-12 | 2009-09-23 | 大连理工大学 | Non-contact power transmission system based on Z-source inverter and phase-shifting control method thereof |
| CN102005926A (en) * | 2009-09-03 | 2011-04-06 | 天津工程师范学院 | Non-contact electric energy transmission system based on Z-source inverter and phase-shifted control method of transmission system |
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| "Z-Source Resonant Soft-Switching Converter for Flexible DC Power Distribution Application";Xiaoliang Dong，etc.;《Power and Energy Society General Meeting（PESGM），2016》;20160717;1-5页 |
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